Push-pull valve



NOV- 4, 1958 J. w. F. HOLL PUSH-PULL VALVE Filed sept. 18, 1954 U'niterl States Patent 2,858,851 PUSH-PULL VALVE yJames W. F. Holl, r'Iemple, City, Calif. f Applicatiouseptember 16,-1-954, Serial No. 456,435

4z Claims. (ci. 1374525.13) i 'v his tinvention.. relates. .to.l a pushpull. valve inawhich v.there are .zprovided a. `number ...of portsv ror passages, the gate of; the.l yvalve .heing..mo.vable into variousposit-ions `to lalign 'idiiferent .passages through f rthe valve Land thus directing fluid into various courses, as may be required in a hydraulic system or other uid systems.

An object of my invention is to provide a novel pushp ull valve, the body of which is preferably formed in three pieces, each section or piece of which can be machined or formed of bar stock, thus providing a valve which can be easily assembled and easily fabricated.

Another object of my invention is to provide a novel push-pull valve of the character stated, in which the various parts of the housing can be formed of a metal capable of resisting acids or bases, and this valve being relatively inexpensive and simple to manufacture.

Still another object of my invention is to provide a v push-pull valve of the character stated, in which the llow of iluid through the valve is substantially straight or has a minimum amount of deection from a straight line, thus facilitating flow of uids through the valve.

Other objects, advantages and features of invention may appear from' the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

Figure l is a longitudinal sectional view of my pushpull valve.

Figurey 2 is a sectional view taken on line 2--2 of Figure l.

Figure 3 is a transverse sectional view of one of the seal seat assemblies.

Figure 4 is a longitudinal sectional view of a valve embodying my invention and showing a different porting arrangement than that of Figure l.

Figure 5 is a view similar to Figure 4 but showing the gate in another position.

Fig. 6 is a view similar to Figure 4 and showing the gate in still another position.

Referring more particularly to the drawing, the numeral 1 indicates the body of my valve, and this body consists of three parts, a top plate 2 and a bottom plate 3. These top and bottom plates can be readily machined from bar stock and, therefore, a suitable metal can be easily procured which will withstand acids and bases which might flow through the valve. The cylinder portion 4 of the body is positioned between the upper and lower plates 2 3 and may also be machined from bar stock, if it is found expedient. The cylinder 4 and the top and bottom plates 2 and 3 are bolted together by the bolts 5, thus properly assemblying the various parts and also enabling these parts to be disassembled if it is necessary to replace or repair any of the parts of the valve. A pitman 6 extends from the slide plate 7 and the pitman permits the slide 7 to be moved to various positions within the valve body 1, as might be necessary in opening and closing the valve. Suitable packing 8 may be provided in the cylinder portion 4 around the pitman 6 to prevent leakage past this pit- @fEatente'd 'fi-'Nove' '14, Tilt-95,8

v"ice man. The Vtop plate 2 mayfbe-provided*with -por-tsf9 vterport 16,normallylclosedI by the plugl l17. "Toobtain 5hydraulic balance in-the valve '-the -plug =17 is used.'However," ifhhydraulic -balance-is not essential then the plug -17 can be lremovedand the-port 16may then be connected to asump, yorthe like.

passage is a balance conduit so as to balance hydraulic pressures on both ends of the slide or gate 7. The slide 7 is formed with a number of channels or ports extending vertically therethrough and shown at 23, 24 and 25. These passages can be variously arranged to connect the ports 9-10, 14 or 15. The arrangement shown in Figure l is normally termed a four-way valve, although it is evident that other porting can be arranged if desired.

The bottom surface of the top plate 2 and the top -surface of the bottom plate 3 are machined and are as nearly parallel as possible. However, there will be some inequalities and, in order that a proper seal may be had against the slide or gate 7, I'provide seal seats 26 around each of the ports 14, 15 and 16, each of which are constructed as follows: An outer sleeve 27 tits within a recess 28 in the plate 3 or the plate 2, and the outer -surface of the sleeve is knurled, as shown at 29. The purpose of this knurling is to permit tluid to move on the outside of the sleeve and to pass downwardly into the sump part of the valve, or the hydraulic system. Also no close tolerances are required in the plate portion of the valve and the seal seat can also be easily replaced when necessary. An inner sleeve 30 is mounted within the sleeve 27 and the inner sleeve is provided with an 0-ring 31 which bears against the inside of the sleeve 27. A second O-ring 32 in the sleeve 30 bears against the bottom of the recess in which the seal seat is mounted. A spring 33 bears against the sleeve 30 and also against the sleeve 27 for the purpose of press- 'mg these sleeves against the plate 3 and the slide 7, respectively. This type of seal seat is also shown and described in my co-pending application, Serial No..

352,675, filed May 4, 1953,- on the invention entitled Rotary Valve With Seal Seat. One or more seal seats 34 may also be provided in the top plate 2 and surrounding the ports 9 or 10, as may be required.

ln the off position of the valve, as shown in Figure 5, a hydraulic balance will be achieved on both sides of the slide or gate 7, thus enabling this slide to be readily moved back and forth to various positions.

Having described my invention, I claim:

l. A push-pull valve including a top plate and a bottom plate and a cylinder portion arranged between said plates, detachable means securing the plates to the cylinder portion, a gate slidably mounted in the cylinder portion, one face of the gate engaging the top plate and another face of the gate engaging the bottom plate, said top plate having ports extending therethrough, said bottom plate having ports extending therethrough, and said gate having channels extending therethrough, .said channels being variously alignable with the ports in the top and bottom plate-s, a seal seat positioned in various of said ports, each seal seat being positioned within one of the ports, said top and bottom plates having recesses therein from which said ports extend, each Seal seat ,including a first sealing means bearing against a plate lin which it is mounted, and a second sealing means bearing against a flat surface of said gate, the outer surv 2. A push-pull valve including a top plate and a boty tom plate and a cylinder portion arranged between said plates, detachable means securngthe plates to the` cyl- Uinder portion, a gate slidably mounted in the cylinder `,and bottom plates, a seal seat positioned in various of `said ports, each sealY seat being positioned within one of the ports, said top and bottom plates having recesses `therein from which said ports extend, each Seal seat including a first sealing means bearing against a plate 'in which it is mounted,

and a second sealing means bearing against a flat surface of said gate, the outer surface of the rst sealing means being knurled to permit passage of uid around the outside of the rst sealing means, and within the recess and one of said plates having a balance passage therein, said passage extending from one end of the gate to the other end thereof.

References Cited inthe le of this patent UNITED STATES PATENTS 39,812 Hayman Sept. 8, 1863 1,237,693 Prott Aug. 21, 1917 1,958,858 Murray May 15, 1934 2,291,563 Rotter July 28, 1942 2,529,412 Parker Nov. 7, 1950 2,601,967 Larsen Iuly 1, 1952 2,601,990 Holzer July 1, 1952 2,628,060 y Parker u Feb. 10, 1953 2,669,416 Hilton Feb. 16, 1954 2,669,417 Ray Feb. 16, 1954 2,703,217. 1955 Ashtonet al. Mar. l, 

